Abstract
1. 1. The EKG and systolic tension of isolated, perfused hearts from Peromyscus leucopus is a function of the perfusion temperature. 2. 2. The marked loss of 42K during perfusion at lower temperatures indicates a loss of intracellular potassium and suggests a breakdown in the ability to maintain electrolyte balance. 3. 3. The decline in EKG potential and tension as well as the increased 42K efflux which occur at perfusion temperatures similar to the lower range of body temperature during torpidity of the intact animal indicate that cardiac performance may limit the depth and length of torpor in P. leucopus.
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More From: Comparative Biochemistry and Physiology -- Part A: Physiology
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